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Common Stock and Stock Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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May. 31, 2015 USD ($) $ / shares shares | May. 31, 2014 USD ($) $ / shares shares | May. 31, 2013 USD ($) $ / shares shares
Class A Convertible Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Common Stock, No Par Value | $ / shares | $ 0 |  |
Common stock, number of shares authorized (in shares) | shares | 200,000,000 |  |
Common stock conversion | Each share of Class A Common Stock is convertible into one share of Class B Common Stock. |  |
Common stock, Class A conversion ratio to Class B (in shares) | 1 |  |
Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Common Stock, No Par Value | $ / shares | $ 0 |  |
Common stock, number of shares authorized (in shares) | shares | 1,200,000,000 |  |
Stock Incentive Plan 1990 | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Shares available for grant (in shares) | shares | 326,000,000 |  |
Stock options vesting period (in years) | 4 years |  |
Stock options expiration from the date of grant (in years) | 10 years |  |
Minimum term of market traded options for estimates of expected volatility (in years) | 1 year |  |
Weighted average remaining contractual life for options outstanding (in years) | 6 years |  |
Weighted average remaining contractual life for options exercisable (in years) | 4 years 8 months 12 days |  |
Aggregate intrinsic value for options outstanding | $ 3,178 |  |
Aggregate intrinsic value for options exercisable | 2,235 |  |
Total intrinsic value of options exercised | $ 795 | $ 474 | $ 293
Stock Options | Stock Incentive Plan 1990 |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period (in years) | 1 year 10 months 24 days |  |
Stock Options | Stock Incentive Plan 1990 | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Weighted average fair value per share of the options granted (in dollars per share) | $ / shares | $ 16.95 |  |
Employee Stock | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Employee stock purchase plans, payroll deductions | 10.00% |  |
Employee stock purchase plan offering period | 6 months |  |
Shares purchased, price as percentage of lower of the fair market value | 85.00% |  |
Purchase of shares by employee (in shares) | shares | 1,400,000 | 1,400,000 | 1,600,000
Employee Stock | Stock Incentive Plan 1990 | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Weighted average fair value per share of the options granted (in dollars per share) | $ / shares |  | $ 14.89 | $ 12.71
Restricted Stock | Stock Incentive Plan 1990 | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Restricted and unrestricted stock granted to key employees under 1990 Plan, number of shares (in shares) | shares | 300,000 | 300,000 | 1,600,000
Restricted stock granted to key employees under 1990 Plan, weighted average values per share (in dollars per shares) | $ / shares | $ 79.38 | $ 63.89 | $ 46.86
Restricted stock vested, fair value | $ 20 | $ 28 | $ 25
Restricted Stock Units (RSUs) | Stock Incentive Plan 1990 |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period (in years) | 1 year 6 months |  |
Unrecognized compensation costs from restricted stock, net of estimated forfeitures | $ 48 |  |
General and Administrative Expense | Stock Options | Stock Incentive Plan 1990 |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Unrecognized compensation costs from stock options, net of estimated forfeitures | $ 180 |  |

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- Definition The percentage of the fair market value that shares are purchased by participants participating in the Employee Stock Purchase Plan. The percentage is applied to the lower of the fair market value at the beginnning or the end of the offering period. + References No definition available. + Details
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- Definition Minimum Term of Market Traded Options For Estimates of Expected Volatility + References No definition available. + Details
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- Definition Describe the conversion features of common stock if such stock is convertible. That is, shares of common stock into which another convertible security was converted, or shares of common stock into which another class of common stock was converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Face amount per share of no-par value common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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